Thermostatic valve



w. J. HERDMAN'.

THERMOSTATIC VALVE. APPLICATION FILED JAN.22. I9I6.

Patented Jan. 6, 1920.

2 SHEETS-SHEET I.

"i /Z 2, messes "W2 (names:-

W. J. HERDMAN.

THERMOSTATIQ VALVE. APPLICATION FILED JAN. 22. 1916.

Patented Jan. 6, 1920.

2 SHEETSSHEET 2.

UNITED STATES WILLIAM J. HERDMAN, OF TORONTO, ON TARIO, CANADA.

THERMOSTATIG VALVE.-

To aZZ whom it may concern:

Be it known that I, WILLIAM J. HERDMAN, a citizen of the United States of Amerlca,

and a resident of Toronto, county of York,

Province ofOntario, Canada, have invented a new and useful Improvement in Thermostatic Valves, of which the following is a specification.

My invention relates to thermostatic valves and pertains specifically to a thermally controlled and-operated turn-valve or cock which may be used to control the flow of either gases or liquids but which through its novel teatures is especially adapted to interrupt the flow of illuminating gas in gas water heaters. I A

The principal. objects of my invention are to provide a thermally operated turn-valve of simple and rugged construction in which the temperature of,c1osure and the temperature of opening are independently variable and in which the termination and initiation Fig. 3 is a detail of the regulating means? Fig. 4 is a sectional view of the turn valve taken on the line B-B of Fig. 2.

Referring now to the drawings which show an embodiment of my device especially designed for use in connection with household gas hot water heaters; 1, is a metal casting, preferably of brass, and of substantially rectangular shape and comparatively shallow depth. It is adapted to beprovide'd with acovcr, not shown in the figures, which Specification of Letters Patent.

Application filed January 22, 1916. Serial No. 73,595. L

Patented Jan. 6, 1920.

extends through the boss and into the interior of the casting 1. This aperture is counterbored at its outer extremity to receive a copper tube 3 which is soldered therein to make a water tight joint; A plu 5 is soldered into the other extremity of t e copper tube 3 and a rod of porcelain carbon, invar or other material of low coefiiciency of expansion lies within the tube 3 and extends through the hole in the boss 2 to emerge within the walls of casting 1. The tube 3 and rod constitute the thermostatic elements of my device, and are adapted to be immersed in the fluid,- the temperature of which is to be controlled. A boss-8 serves to support a lever Gwhich is rotatively attached to the boss by means of a screw 7 The lever 6 carries a lug in which is threaded an adjustingscrew 11 adapted to be locked in position'by means of a lock nut 12. The lug on the lever 6 is so positioned as to bring the screw 11 to bear upon the rod 4, as shown in the figures. A further lug on the lever 6 is attached by means of a spring 9 to the is held in place by screws entering tapped" holes as 32 and 33 and thus serves as a con tainer for the operating mechanism of the device.

A boss is provided on the casting 1, concentric with the major axis of the casting. A portion pf this boss is formed to have'flat faces as a nut, and the remainder of the boss is provided with a thread and constitutes means for attaching the device to the hot water system. A centrally located aperture ment'with the rod 4.

casting 1 at a boss 10. This spring serves to hold the screw 11 at all times in engage- A lug orboss on the rear of the cast-in 1, (Fig. 2) provides ports as 30 and 31 ig.

4) for a turn valve as well as means for connecting the device to the gas pipe line 24, 25

as shown in Fig. ,1. The turn valve com-.

- This lever rotates in a counterbored recess in the casting 1 and is secured in place by means of the threaded collar 23 as shown.

Wear of the rotatable member 27 is compensated for by means of a spring 29 car'- ried in a centrally located recess in the rotatable member and held in place by the cap prises a tapered 'rotatable member 27 pro- 26. The cap 26 further serves to seal the out-er extremity of the valve. Room isprovided asshown in'the socket portion of lever 14- to allow the squared shank of the rotameans of the spring 29.

- tends beyond the axis of rotation'of the lever table-member 27 to enter farther therein as the wear of this member is taken up by .The extremlty of the 14 is linked to the free extremity of the lever 14 by a spring 15 and the extent of' lever 6 which exangular rotation of the lever 14 is limited" by means of stop screws 18 and 20 carried in bosses 16 and 17 respectively. a

' It will be observed from the foregoing that as the point of-attachment of spring to lever. 6 is, carried first to one side andthen to the other side of a line connect-' ing the point of attachment of spring 15 with lever 14 and the axis of rotation of lever 14- that the lever 14 will be rotated through the tension of the spring 15 to turn toward the side to which the extremity of the lever 6 has been moved .to thus turn -ofi or on the valve, as the case may be.

- extremity of lever 6 sufliciently to the left of the axis of rotation of lever 14 as viewed in Fig. 1, to cause lever 14 to rotate under tension of spring15 into engagement with stop screw 18 to close the valve as shown in Fig. 4.

As the thermostatic elements cool the copper tube contracts to cause the rod 4 to move upwardto push against screw '11 to rotate lever 6 against tension of spring 9 to carry the extremity of lever 6 toward the .right, as viewed in Fig. 1, until such time as the point of suspension of spring 15 on lever 6 passes slightly to the right, as viewed in the figure of a line connecting the axis of rotation of lever 14 with the point of attachment, of spring 15 with lever 14, at which instant the tension of spring 15 is exerted to cause lever 14 to move to the right into-engagement with stop screw 20 to open the valve.

In designing my device for any predetermined operating range of temperatures it is only necessary to employ thermostatic elements of sufficient length to rotate the 'lever'6 a suflicient angular distance to operature up ate the valve at both of the extremes oftemperature, and then by means of the screw 11 to centralize the motion ofthe lever 6 with respect to the handle 14 of the valve, thereafter the device may be set to close the valve at any desired high temperature down almost to a mean temperature between the two operating temperature limits, or to open the valve at any low temperalmost to the same mean temper-' ature by means of theadjusting screws 18 and 20. The knurled heads of these screws are positioned outside of the walls of the casting 1, and are further provided with index pointers as 19 and 21 respectively to fa- Fig. 3, an arbitrary calibration may be supplied to further facilitate the'setting of the device. I

It is obvious from the foregoing that I have illustrated but one embodiment of my device, and I wish it to be thoroughly understood that I may alter the details of thc device, such as the type of thermostatic elements, their method of functioning with the remaining apparatus of the device, etc. without departing from the spirit or narrowing the scope of my invention.

Having thus fully described my invention what I claim as new and desire to secure bv United States Letters Patent, is as follows 1. In a thermostatic valve, thermostatic elements, a lever operated thereby, a turn valve, a handle for operating said valve,

stops for limiting the motion of said handle,

said stops being'independently adjustable, and a spring connecting said lever with said handle.

' 2. In a thermostatic valve, a turn valve, a handle therefor, thermostatic elements, a lever operated by said thermostatic elements and extending beyond the axis of rotation of said turn valve, and a spring connecting the extremity of said lever with the extremity of said handle.

3. In a thermostatic valve, a rotatable valve, a handle for o crating said valve, a spring attached to tie free extremity of said handle, and passing near the axis of rotation of said valve, and thermally operated means for moving the other extremity of said spring to cause its line of action'to cross the axis of rotation of said valve.

4. In a thermostatic valve, a turn valve, a spring attached to said valve, and thermally operated means adapted to cause said spring'to turn said valve in different directions at different predetermined temperatures.

-5. In a thermostatic valve, a turn valve, a

pair'of adjustable stop positions therefor, a spring biasing'said valve to occupy one or the other of said stop posltions, and thermally operated means for moving said spring WILLIAM J. HERDMAN. Witnesses:

A. SINCLAIR, L. N EWSOME. 

